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RLSA-2026:79281 (CVE-2026-18374)
Vulnerability from osv_rocky – Published: 2026-10-10 12:04 – Updated: 2026-10-10 12:12 – Source website
VLAI
Summary
Moderate: glibc security, bug fix, and enhancement update
Details
The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the name service cache daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.
Security Fix(es):
-
glibc: Glibc: Denial of Service via stack exhaustion during tilde expansion (CVE-2026-6791)
-
glibc: glibc: Process abort due to invalid memory in wordexp (CVE-2026-6368)
-
glibc: Fix out-of-bounds array write in tdelete (CVE-2026-19542)
-
glibc: Non-progress DoS in SHIFT_JISX0213 -> (CVE-2026-77117)
-
glibc: Non-progress DoS in SHIFT_JISX0213 -> UCS-4 conversion state (CVE-2026-80489)
-
glibc: glibc: Heap buffer overflow via attacker-controlled fopen mode string (CVE-2026-18374)
Bug Fix(es) and Enhancement(s):
- glibc: Stop shipping glibc32-debuginfo package (in debug channels) [rhel-9] (JIRA:Rocky Linux-219516)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Severity
5.9 (Medium)
References
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CVE-2026-18374 (GCVE-0-2026-18374)
Vulnerability from cvelistv5 – Published: 2026-08-27 19:20 – Updated: 2026-08-28 15:37
VLAI
EPSS
VEX
Summary
Passing an effectively empty string to the `,ccs=` syntax extension of the mode argument in the `fopen` function in the GNU C Library version 2.45 or earlier may result in a heap buffer overflow when the mode string input to the function is attacker controlled.
This usage pattern is not seen in applications in common GNU/Linux distributions and applications that process user-supplied values for `ccs` should not pass them through without validation.
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 15:36 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://sourceware.org/bugzilla/show_bug.cgi?id=34574 | issue-tracking |
| https://sourceware.org/git/?p=glibc.git;a=blob_pl… | vendor-advisory |
| http://www.openwall.com/lists/oss-security/2026/08/27/6 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The GNU C Library | glibc |
Affected:
0 , < 2.45
(custom)
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CVE-2026-19542 (GCVE-0-2026-19542)
Vulnerability from cvelistv5 – Published: 2026-09-14 17:18 – Updated: 2026-09-14 19:42
VLAI
EPSS
VEX
Title
Stack-based out-of-bounds write in tdelete during tree rebalancing
Summary
Calling tdelete on a sufficiently deep tree in the GNU C Library version 2.1 to 2.44 may write one pointer past the end of an alloca-allocated array on the stack, which may crash the application.
The tdelete implementation keeps an explicit stack of parent nodes for rebalancing, which is grown as needed while descending the tree. Two rebalancing branches push an additional entry without checking the capacity, and write past the array when the stack is exactly full. Triggering this requires a node at a depth of exactly 40 (or 40 plus a multiple of 20), which implies a tree with at least a million nodes, so an attacker must drive a large number of insertions and deletions through an application that uses tsearch and tdelete. The written value is a pointer into a tree node and is not directly attacker controlled. No affected application in common distributions has been identified.
Severity
5.6 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 19:41 UTC
CWE
- CWE-121 - Stack-based buffer overflow
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://sourceware.org/bugzilla/show_bug.cgi?id=34506 | issue-tracking |
| https://sourceware.org/git/?p=glibc.git;a=blob_pl… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The GNU C Library | glibc |
Affected:
2.1 , ≤ 2.44
(custom)
|
Date Public
2026-08-11 04:00
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CVE-2026-6368 (GCVE-0-2026-6368)
Vulnerability from cvelistv5 – Published: 2026-08-10 18:40 – Updated: 2026-08-12 18:01
VLAI
EPSS
VEX
Title
wordexp with WRDE_APPEND can return or use invalid memory
Summary
Calling wordexp with WRDE_APPEND in the GNU C Library version 2.0 to version 2.43 can cause the interface to return invalid memory in the we_wordv member, which on subsequent calls to wordfree may abort the process.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 18:00 UTC
CWE
- CWE-908 - Use of uninitialized resource
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://sourceware.org/bugzilla/show_bug.cgi?id=34090 | issue-tracking |
| https://sourceware.org/git/?p=glibc.git;a=blob;f=… | vendor-advisory |
Date Public
2026-07-01 18:29
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CVE-2026-6791 (GCVE-0-2026-6791)
Vulnerability from cvelistv5 – Published: 2026-08-10 18:41 – Updated: 2026-08-12 18:01
VLAI
EPSS
VEX
Title
Potential stack-based buffer clash during tilde expansion in wordexp
Summary
When expanding paths that begin with a tilde (~) followed by a username, the internal parse_tilde function extracts the username to determine the user's home directory. The implementation allocates memory for this username directly on the stack using the strndupa macro. Because the size of this allocation was determined by the length of the user-supplied input without any bounds checks, passing an excessively long username e.g. thousands of characters, forces the thread to exhaust its stack space. Thus if an application passes untrusted, attacker-controlled input to the wordexp function, an attacker can trigger a stack clash.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 18:01 UTC
CWE
- CWE-121 - Stack-based buffer overflow
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://sourceware.org/bugzilla/show_bug.cgi?id=34091 | issue-tracking |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The GNU C Library | glibc |
Affected:
2.0 , ≤ 2.43
(custom)
|
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CVE-2026-77117 (GCVE-0-2026-77117)
Vulnerability from cvelistv5 – Published: 2026-09-15 10:48 – Updated: 2026-09-15 12:26
VLAI
EPSS
VEX
Title
SHIFT_JISX0213 decoding may hang on crafted input
Summary
Converting crafted SHIFT_JISX0213 input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.3 to 2.44 may result in the converter making no progress, causing the calling application to hang.
Some SHIFT_JISX0213 sequences decode to two code points. If the output buffer has room for only the first one, the converter stores the second in the conversion state and returns E2BIG, but it never clears that pending character after emitting it on the next call. The converter then keeps emitting the pending character without consuming further input, so an application that retries the conversion loops forever. The input must be attacker controlled and the application must convert it with an output buffer small enough to split the two code points. Only the SHIFT_JISX0213 character set is affected, which is not commonly used. The related defect in the EUC_JISX0213 converter is tracked separately as CVE-2026-80489.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 12:26 UTC
CWE
- CWE-835 - Loop with unreachable exit condition ('infinite loop')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://sourceware.org/bugzilla/show_bug.cgi?id=34556 | issue-tracking |
| https://sourceware.org/git/?p=glibc.git;a=blob_pl… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The GNU C Library | glibc |
Affected:
2.3 , ≤ 2.44
(custom)
|
Date Public
2026-08-21 04:00
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CVE-2026-80489 (GCVE-0-2026-80489)
Vulnerability from cvelistv5 – Published: 2026-09-15 10:51 – Updated: 2026-09-15 12:22
VLAI
EPSS
VEX
Title
EUC_JISX0213 decoding may hang on crafted input
Summary
Converting crafted EUC_JISX0213 input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.3 to 2.44 may result in the converter making no progress, causing the calling application to hang.
Some EUC_JISX0213 sequences decode to two code points. If the output buffer has room for only the first one, the converter stores the second in the conversion state and returns E2BIG, but it never clears that pending character after emitting it on the next call. The converter then keeps emitting the pending character without consuming further input, so an application that retries the conversion loops forever. The input must be attacker controlled and the application must convert it with an output buffer small enough to split the two code points. Only the EUC_JISX0213 character set is affected, which is not commonly used. The related defect in SHIFT_JISX0213 converter is tracked separately as CVE-2026-77117.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 12:21 UTC
CWE
- CWE-835 - Loop with unreachable exit condition ('infinite loop')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://sourceware.org/bugzilla/show_bug.cgi?id=34568 | issue-tracking |
| https://sourceware.org/git/?p=glibc.git;a=blob_pl… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The GNU C Library | glibc |
Affected:
2.3 , ≤ 2.44
(custom)
|
Date Public
2026-08-26 04:00
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Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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