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9 vulnerabilities by nghttp2
CVE-2026-40170 (GCVE-0-2026-40170)
Vulnerability from cvelistv5 – Published: 2026-04-16 21:34 – Updated: 2026-04-20 15:00
VLAI
Title
ngtcp2 has a qlog transport parameter serialization stack buffer overflow
Summary
ngtcp2 is a C implementation of the IETF QUIC protocol. In versions prior to 1.22.1, ngtcp2_qlog_parameters_set_transport_params() serializes peer transport parameters into a fixed 1024-byte stack buffer without bounds checking. When qlog is enabled, a remote peer can send sufficiently large transport parameters during the QUIC handshake to cause writes beyond the buffer boundary, resulting in a stack buffer overflow. This affects deployments that enable the qlog callback and process untrusted peer transport parameters. This issue has been fixed in version 1.22.1. If developers are unable to immediately upgrade, they can disable the qlog on client.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-121 - Stack-based Buffer Overflow
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/ngtcp2/ngtcp2/security/advisor… | x_refsource_CONFIRM |
| https://github.com/ngtcp2/ngtcp2/commit/708a7640c… | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2026/0… |
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CVE-2026-27135 (GCVE-0-2026-27135)
Vulnerability from cvelistv5 – Published: 2026-03-18 17:59 – Updated: 2026-05-13 21:31
VLAI
Title
nghttp2 Denial of service: Assertion failure due to the missing state validation
Summary
nghttp2 is an implementation of the Hypertext Transfer Protocol version 2 in C. Prior to version 1.68.1, the nghttp2 library stops reading the incoming data when user facing public API `nghttp2_session_terminate_session` or `nghttp2_session_terminate_session2` is called by the application. They might be called internally by the library when it detects the situation that is subject to connection error. Due to the missing internal state validation, the library keeps reading the rest of the data after one of those APIs is called. Then receiving a malformed frame that causes FRAME_SIZE_ERROR causes assertion failure. nghttp2 v1.68.1 adds missing state validation to avoid assertion failure. No known workarounds are available.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-617 - Reachable Assertion
Assigner
References
4 references
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CVE-2024-28182 (GCVE-0-2024-28182)
Vulnerability from cvelistv5 – Published: 2024-04-04 14:41 – Updated: 2025-11-04 18:30
VLAI
Title
Reading unbounded number of HTTP/2 CONTINUATION frames to cause excessive CPU usage
Summary
nghttp2 is an implementation of the Hypertext Transfer Protocol version 2 in C. The nghttp2 library prior to version 1.61.0 keeps reading the unbounded number of HTTP/2 CONTINUATION frames even after a stream is reset to keep HPACK context in sync. This causes excessive CPU usage to decode HPACK stream. nghttp2 v1.61.0 mitigates this vulnerability by limiting the number of CONTINUATION frames it accepts per stream. There is no workaround for this vulnerability.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
10 references
Impacted products
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CVE-2023-44487 (GCVE-0-2023-44487)
Vulnerability from cvelistv5 – Published: 2023-10-10 00:00 – Updated: 2026-05-12 10:52Summary
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
Severity
7.5 (High)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
173 references
Impacted products
6 products
| Vendor | Product | Version | |
|---|---|---|---|
| ietf | http |
Affected:
2.0
cpe:2.3:a:ietf:http:2.0:*:*:*:*:*:*:* |
|
| Siemens | RUGGEDCOM APE1808 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SINEC NMS |
Affected:
0 , < V3.0
(custom)
|
|
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
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CVE-2023-35945 (GCVE-0-2023-35945)
Vulnerability from cvelistv5 – Published: 2023-07-13 20:41 – Updated: 2024-10-31 16:24
VLAI
Title
Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec
Summary
Envoy is a cloud-native high-performance edge/middle/service proxy. Envoy’s HTTP/2 codec may leak a header map and bookkeeping structures upon receiving `RST_STREAM` immediately followed by the `GOAWAY` frames from an upstream server. In nghttp2, cleanup of pending requests due to receipt of the `GOAWAY` frame skips de-allocation of the bookkeeping structure and pending compressed header. The error return [code path] is taken if connection is already marked for not sending more requests due to `GOAWAY` frame. The clean-up code is right after the return statement, causing memory leak. Denial of service through memory exhaustion. This vulnerability was patched in versions(s) 1.26.3, 1.25.8, 1.24.9, 1.23.11.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/envoyproxy/envoy/security/advi… | x_refsource_CONFIRM |
| https://github.com/nghttp2/nghttp2/blob/e7f594065… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| envoyproxy | envoy |
Affected:
>= 1.26.0, < 1.26.3
Affected: >= 1.25.0, < 1.25.8 Affected: >= 1.24.0, < 1.24.9 Affected: >= 1.23.0, < 1.23.11 |
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CVE-2020-11080 (GCVE-0-2020-11080)
Vulnerability from cvelistv5 – Published: 2020-06-03 00:00 – Updated: 2025-06-09 15:45
VLAI
Title
Denial of service in nghttp2
Summary
In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., > 32), then drop the connection.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-707 - Improper Enforcement of Message or Data Structure
Assigner
References
14 references
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CVE-2016-1544 (GCVE-0-2016-1544)
Vulnerability from cvelistv5 – Published: 2020-02-06 14:20 – Updated: 2024-08-05 23:02
VLAI
Summary
nghttp2 before 1.7.1 allows remote attackers to cause a denial of service (memory exhaustion).
Severity
No CVSS data available.
CWE
- Other
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1308461 | x_refsource_CONFIRM |
| https://github.com/nghttp2/nghttp2/releases/tag/v1.7.1 | x_refsource_CONFIRM |
| https://github.com/nghttp2/nghttp2/compare/v1.7.0… | x_refsource_CONFIRM |
| https://security.gentoo.org/glsa/201612-13 | x_refsource_CONFIRM |
| http://lists.fedoraproject.org/pipermail/package-… | x_refsource_CONFIRM |
| http://lists.fedoraproject.org/pipermail/package-… | x_refsource_CONFIRM |
Date Public
2016-02-15 00:00
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CVE-2018-1000168 (GCVE-0-2018-1000168)
Vulnerability from cvelistv5 – Published: 2018-05-08 15:00 – Updated: 2025-06-09 15:47
VLAI
Summary
nghttp2 version >= 1.10.0 and nghttp2 <= v1.31.0 contains an Improper Input Validation CWE-20 vulnerability in ALTSVC frame handling that can result in segmentation fault leading to denial of service. This attack appears to be exploitable via network client. This vulnerability appears to have been fixed in >= 1.31.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-476 - NULL Pointer Dereference
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2019:0367 | vendor-advisoryx_refsource_REDHAT |
| https://nodejs.org/en/blog/vulnerability/june-201… | x_refsource_CONFIRM |
| http://www.securityfocus.com/bid/103952 | vdb-entryx_refsource_BID |
| https://nghttp2.org/blog/2018/04/12/nghttp2-v1-31-1/ | x_refsource_CONFIRM |
| https://access.redhat.com/errata/RHSA-2019:0366 | vendor-advisoryx_refsource_REDHAT |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
Date Public
2018-04-12 00:00
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CVE-2015-8659 (GCVE-0-2015-8659)
Vulnerability from cvelistv5 – Published: 2016-01-12 19:00 – Updated: 2024-08-06 08:20
VLAI
Summary
The idle stream handling in nghttp2 before 1.6.0 allows attackers to have unspecified impact via unknown vectors, aka a heap-use-after-free bug.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
15 references
Date Public
2015-12-23 00:00
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