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CVE-2026-77422 high CVSS 7.5

Vulnerability in org.jline:jline-builtins (CVE-2026-77422)

Summary

Vulnerability in org.jline:jline-builtins (CVE-2026-77422). Risk of unauthorized operations or information disclosure. Exploitable via grep. Mitigation: upgrade to 3.30.15 or later.

Original description

The description as published by the source.

Summary

The JLine3 built-in grep command wraps the user-supplied regular expression with
.* before compiling it with Java's backtracking regex engine. This amplifies
catastrophic backtracking and allows a short pattern such as (a+)+b to hang the
command thread on non-matching input. In environments that expose the JLine shell to
remote users, this is a denial-of-service issue.

Details

In builtins/src/main/java/org/jline/builtins/PosixCommands.java, the grep
implementation rewrites the user pattern before compilation:

String regex = args.remove(0);
String regexp = regex;
if (opt.isSet("word-regexp")) {
    regexp = "\\b" + regexp + "\\b";
}
if (opt.isSet("line-regexp")) {
    regexp = "^" + regexp + "$";
} else {
    regexp = ".*" + regexp + ".*";
}

The transformed pattern is compiled with Pattern.compile(...) and then used to test
each input line. For a payload such as (a+)+b, the automatic .* prefix and suffix
increase the backtracking search space substantially.

Affected source location:

  • builtins/src/main/java/org/jline/builtins/PosixCommands.java
  • grep(...)

PoC

  1. Create a file containing a long run of a characters:
printf 'aaaaaaaaaaaaaaaaaaaaaaa\n' > /tmp/testfile.txt
  1. Run JLine3's built-in grep against that file:
grep '(a+)+b' /tmp/testfile.txt

Expected result:

  • The command stops responding.
  • The executing thread consumes high CPU.

Reproduction environment:

  • JLine3 on x86_64 Linux
  • O…

Source: NIST National Vulnerability Database NVD GitHub Advisory

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 CVE-2026-77422 has been found in org.jline:jline-builtins.
Attackers can target a specific entry point like grep over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade org.jline:jline-builtins to 3.30.15 or later.
If unsure, ask your IT team or search "org.jline:jline-builtins CVE-2026-77422" on the vendor's site.

CVE-2026-77422 (org.jline:jline-builtins) — CWE-1333 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: grep
Patched: 3.30.15 — 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.

❓ What is the problem

A vulnerability (CWE-1333) exists in org.jline:jline-builtins. Attackers reach the vulnerable code path via grep without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of org.jline:jline-builtins. Attack surface: grep.

🔥 Severity

Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 3.30.15.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで org.jline:jline-builtins を使っているサービスとバージョンを洗い出す。

  2. 2
    Apply patch patch 
    Upgrade org.jline:jline-builtins to 3.30.15

    ステージング環境で 3.30.15 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. 3
    Post-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

maven org.jline:jline-builtins
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.30.15"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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