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. Starting in version 2.0.0 and prior to version 3.0.6 and 4.0.2, an uncontrolled resource consumption / algorithmic complexity vulnerability (CWE-400) affects any application that parses untrusted email with this library. Three independent parsing paths are super-linear in cost, so a byte-size cap on the caller side does not bound the work done. A crafted message under 2 MB can consume seconds of CPU or hundreds of megabytes to multiple gigabytes of memory (leading to an out-of-memory kill), enabling denial of service. The parse is lazy, but the cost is paid on the first getAllParts() or content read. This is fxed in 4.0.2 and 3.0.6. The fixes add configurable limits on multipart nesting depth and on header count / total header size (recording a parse error past the threshold rather than throwing), and change sibling append to O(n). Users should upgrade to one of these (or later) versions. Versions 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. (Versions prior to 2.0 used a different parser and are not affected by all three paths.) These costs are super-linear, so an input byte-size cap alone does not bound them. Until upgrading, restrict exposure of the parser to untrusted input, and run parsing under a constrained memory_limit and execution time limit so a malicious message fails its own request rather than exhausting the host.
CVE-2026-61816
“—” beside the score: it is equal to the CVSS score beside it.
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-24. A secondary CVSS source baseline 7.5; sources differ by 0.0.
Also known asEUVD-2026-86336 (ENISA EUVD) · GHSA-f6v3-2qmr-vfjx (GitHub Security Advisories)Source: ENISA EUVD
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 65EG Risk 65/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.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
- 0.4%
- EPSS %ILE
- 33rd
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; 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 public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
September 24, 2026
Last Modified
September 30, 2026
Advisory Details (1)
Auto-updated Sep 24, 2026Uncontrolled resource consumption (CPU/memory DoS) parsing untrusted MIME in zbateson/mail-mime-parser · Advisory · zbateson/mail-mime-parser · GitHub
Affected: 4.0.2 and 3.0.6. The fixes add configurable limits on multipart nesting depth and
https://github.com/zbateson/mail-mime-parser/security/advisories/GHSA-f6v3-2qmr-vfjxVendor Advisories for CVE-2026-61816(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(2)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| composer | zbateson/mail-mime-parser @ 3.0.6 (fixes >= 2.0.0, < 3.0.6) | — | ghsa |
| composer | zbateson/mail-mime-parser @ 4.0.2 (fixes >= 4.0.0, < 4.0.2) | — | ghsa |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(1 across 1 ecosystem)
Packagist(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| zbateson/mail-mime-parser | 4.0.0, 4.0.1 |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 10× in last 7d / 48× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
- 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-11-01 07:41 UTCGHSA enrichmentGHSA-f6v3-2qmr-vfjx · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-11-01 07:41 UTCEG score recompute
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-27 20:04 UTCEG score recompute
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-25 14:14 UTCEG score recompute
- 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
- 2026-10-20 10:58 UTCEG score recompute
- 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-18 03:25 UTCEG score recompute
- 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
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- 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-13 13:20 UTCEG score recompute
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-12 15:50 UTCEG score recompute
- 2026-10-11 19:34 UTCEG score recompute
- 2026-10-11 16:49 UTCEG score recompute
- 2026-10-11 14:11 UTCEG score recompute
- 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-10 23:15 UTCEG score recompute
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-10 00:05 UTCEG score recompute
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-08 23:31 UTCEG score recompute
- 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-08 00:17 UTCEG score recompute
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-07 00:52 UTCEG score recompute
- 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-06 01:32 UTCEG score recompute
- 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-05 02:14 UTCEG score recompute
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-03 15:28 UTCEG score recompute
- 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-03 03:53 UTCEG score recompute
- 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-10-02 04:36 UTCEG score recompute
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-09-30 15:12 UTCEG score recompute
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 30th percentile
- 2026-09-29 16:00 UTCEG score recompute
- 2026-09-29 04:25 UTCEG score recompute
- 2026-09-27 17:40 UTCEG score recompute
- 2026-09-26 18:29 UTCEG score recompute
- 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 30th percentile
- 2026-09-26 06:52 UTCEG score recompute
- 2026-09-24 18:35 UTCEG score recompute
- 2026-09-24 18:02 UTCEG score recomputeFirst assessed: 7.5 HIGH
- 2026-09-24 18:01 UTCMITRE cvelistV5first tracked
Related CVEs(same product + same CWE)
Frequently asked(5)
What is CVE-2026-61816?
When was the CVE record for CVE-2026-61816 published?
Is CVE-2026-61816 actively exploited?
What is the CVSS score of CVE-2026-61816?
How do I remediate CVE-2026-61816?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-61816
Is Your Infrastructure Affected by CVE-2026-61816?
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