Vulnerability in py3-pygments
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 ALPINE-CVE-2021-27291 has been found in py3-pygments.
Risk of unauthorized operations or information disclosure.
What to do: upgrade py3-pygments to 2.7.4 or later.
If unsure, ask your IT team or search "py3-pygments ALPINE-CVE-2021-27291" on the vendor's site.
ALPINE-CVE-2021-27291 (py3-pygments)
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 2.7.4 — 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 py3-pygments.
Check the vendor advisory for the affected versions of py3-pygments.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 2.7.4.
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 'py3-pygments' . 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
-
1
Identify exposureidentify
grep -r 'py3-pygments' . | 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
py3-pygmentsを grep し、稼働しているサービス・バージョンを把握する。 -
2
Apply patchpatch
Upgrade py3-pygments to 2.7.4ステージング環境で 2.7.4 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。
-
3
Post-deployment verificationverify
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
| Ecosystem | Package | Affected | Fixed |
|---|---|---|---|
| Alpine:v3.11 | py3-pygments |
< 2.5.2-r1 |
2.5.2-r1 |
| Alpine:v3.12 | py3-pygments |
< 2.6.1-r1 |
2.6.1-r1 |
Original description The description as published by the source.
In pygments 1.1+, fixed in 2.7.4, the lexers used to parse programming languages rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an attacker can cause a denial of service.
Source: OSV.dev (Open Source Vulnerabilities) OSV
References
- advisory security.alpinelinux.org