zbateson/mail-mime-parser is a mail mime parser alternative to PHP's imap* functions and Pear libraries for reading messages in Internet Message Format RFC 822. Prior to version 3.0.6 and 4.0.2, CRLF (carriage-return / line-feed) header injection (CWE-93) affecting any application that uses this library to build or forward MIME messages with an attacker-influenced attachment filename. Attachment filenames are interpolated into the Content-Type and Content-Disposition header values without stripping CR/LF, so a filename containing \r\n serializes as one or more additional, attacker-controlled header lines (for example a forged Bcc: that silently exfiltrates a copy of the outgoing message). The untrusted filename can come directly from parsed inbound mail, so no local construction is required — an application that re-attaches or re-sends a parsed filename is exposed. Versions 3.0.6 and 4.0.2 patch the issue. Versions 1.x and 2.x are also affected but are end-of-life and will not receive patches; users on those lines should upgrade to a fixed release. If upgrading is not immediately possible, strip CR and LF from any filename before passing it to attachment APIs, and from the result of getFilename() before reusing it in a constructed message — e.g. preg_replace('/[\r\n]+/', ' ', $filename).
CVE-2026-61815
This high-severity CVE scores 7.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (6th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 7.2
- EG Score
- 7.2HIGHmedium confidence
- EG Risk
- 37EG Risk 37/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity72% × 45%Exploitation0% × 40%Automatability30% × 15%CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.2%
- EPSS %ILE
- 6th
- KEV
- Not listed
CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
September 24, 2026
Last Modified
September 30, 2026
Advisory Details (1)
Auto-updated Sep 24, 2026CRLF header injection via attachment filename in zbateson/mail-mime-parser · Advisory · zbateson/mail-mime-parser · GitHub
Affected: 4.0.2 and 3.0.6. Users should upgrade to one of these (or later) versions.
https://github.com/zbateson/mail-mime-parser/security/advisories/GHSA-36h5-qg4p-q2qfVendor Advisories for CVE-2026-61815(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
Packagist(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| zbateson/mail-mime-parser | 0.1.0 ... 3.0.5 (68 versions) | 3.0.6 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 12× in last 7d / 18× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-10-04 01:41 UTCEG score recompute
- 2026-10-03 14:26 UTCEPSS rescore
- 2026-10-03 02:59 UTCEG score recompute
- 2026-10-02 17:56 UTCEPSS rescore
- 2026-10-02 04:22 UTCEG score recompute
- 2026-10-01 19:50 UTCEPSS rescore
- 2026-09-30 17:48 UTCEG score recompute
- 2026-09-30 15:03 UTCEPSS rescore
- 2026-09-29 23:53 UTCEG score recompute
- 2026-09-29 00:31 UTCEG score recompute
- 2026-09-28 13:51 UTCEPSS rescore
- 2026-09-27 14:34 UTCEG score recompute
- 2026-09-27 03:16 UTCEG score recompute
- 2026-09-26 15:59 UTCEPSS rescore
- 2026-09-26 04:34 UTCEG score recompute
- 2026-09-24 18:35 UTCEG score recompute
- 2026-09-24 17:57 UTCEG score recompute
- 2026-09-24 17:56 UTCMITRE cvelistV5first tracked
Related CVEs(same product + same CWE)
Frequently asked(5)
What is CVE-2026-61815?
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What is the CVSS score of CVE-2026-61815?
How do I remediate CVE-2026-61815?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-61815
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