RHSA-2026:10995
Vulnerability from csaf_redhat - Published: 2026-04-27 17:24 - Updated: 2026-05-28 20:58Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
sed:
* sed-4.10-1.hum1 (aarch64, x86_64)
* sed-4.10-1.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A Time-of-Check Time-of-Use (TOCTOU) race condition was found in GNU sed. When the -i (in-place) and --follow-symlinks options are used together, sed resolves the symlink but reopens the path for writing. An attacker with write access to the directory containing the symlink can swap it between the check and the open operations. If a privileged user executes sed in this manner on a path influenced by the attacker, it can lead to arbitrary file overwrites and potential privilege escalation.
6.3 (Medium)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:sed-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:sed-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:sed-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
9 references
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"vulnerabilities": [
{
"cve": "CVE-2026-5958",
"cwe": {
"id": "CWE-367",
"name": "Time-of-check Time-of-use (TOCTOU) Race Condition"
},
"discovery_date": "2026-04-16T15:59:01.238000+00:00",
"ids": [
{
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"text": "2458960"
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"notes": [
{
"category": "description",
"text": "A Time-of-Check Time-of-Use (TOCTOU) race condition was found in GNU sed. When the -i (in-place) and --follow-symlinks options are used together, sed resolves the symlink but reopens the path for writing. An attacker with write access to the directory containing the symlink can swap it between the check and the open operations. If a privileged user executes sed in this manner on a path influenced by the attacker, it can lead to arbitrary file overwrites and potential privilege escalation.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "sed: GNU sed TOCTOU race condition",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is a Moderate severity flaw in GNU sed that allows for arbitrary file overwrite. The vulnerability is a Time-of-Check Time-of-Use (TOCTOU) race condition in the `--follow-symlinks` option, enabling an attacker to cause `sed -i --follow-symlinks` to read attacker-controlled content and write it to an unintended file. Exploitation requires a privileged process to execute `sed` on a path that an attacker can influence.",
"title": "Statement"
},
{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"fixed": [
"Red Hat Hardened Images:sed-main@aarch64",
"Red Hat Hardened Images:sed-main@src",
"Red Hat Hardened Images:sed-main@x86_64"
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"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5958"
}
],
"release_date": "2026-04-19T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-27T17:24:22+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:sed-main@aarch64",
"Red Hat Hardened Images:sed-main@src",
"Red Hat Hardened Images:sed-main@x86_64"
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},
{
"category": "workaround",
"details": "To mitigate this vulnerability, avoid using the `sed -i --follow-symlinks` command in privileged contexts or on paths that can be influenced by untrusted users. This flaw specifically affects the `--follow-symlinks` option, which, when used by a privileged process on an attacker-controlled path, can lead to arbitrary file overwrite. Restricting the use of this specific option in sensitive operations can reduce the risk of exploitation.",
"product_ids": [
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"scores": [
{
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"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
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"Red Hat Hardened Images:sed-main@x86_64"
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "sed: GNU sed TOCTOU race condition"
}
]
}
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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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