Vulnerability in diffutils (UBUNTU-CVE-2026-53910)
Summary
Vulnerability in diffutils (UBUNTU-CVE-2026-53910). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1:3.3-1ubuntu0.1~esm1 or later.
Original description
The description as published by the source.
diff3 tool from GNU diffutils is vulnerable to a heap‑based buffer overflow due to multiple signed integer overflows in line‑mapping calculations. Incorrect arithmetic in mapping line ranges can result in corrupted values being used for memory allocation and loop bounds. When processing crafted diff output, these overflows may cause the application to allocate insufficient memory and subsequently perform out‑of‑bounds writes during internal processing. An attacker who can control the output of the diff program used by diff3 (e.g. via --diff-program pointing to a malicious script) can trigger out-of-bounds writes, resulting in a crash and potentially remote code execution depending on the environment. This issue has been fixed in commit 9ff04d5b84743e331e80b589335a52c5480d1815 NOTE: The project maintainers claim that this is not a security issue. They state that the worst outcome this issue can cause is a crash of diff and that it cannot be used to escalate privileges.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as UBUNTU-CVE-2026-53910 has been found in diffutils.
Risk of unauthorized operations or information disclosure.
What to do: upgrade diffutils to 1:3.3-1ubuntu0.1~esm1 or later.
If unsure, ask your IT team or search "diffutils UBUNTU-CVE-2026-53910" on the vendor's site.
UBUNTU-CVE-2026-53910 (diffutils)
Patched: 1:3.3-1ubuntu0.1~esm1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (unclassified) exists in diffutils.
Check the vendor advisory for the affected versions of diffutils.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1:3.3-1ubuntu0.1~esm1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'diffutils' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'diffutils' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
diffutilsを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade diffutils to 1:3.3-1ubuntu0.1~esm1ステージング環境で 1:3.3-1ubuntu0.1~esm1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory ubuntu.com
- report ubuntu.com
- report cve.org