In iTerm2 through 3.6.9, displaying a .txt file can cause code execution via DCS 2000p and OSC 135 data, if the working directory contains a malicious file whose name is valid output from the conductor encoding path, such as a pathname with an initial ace/c+ substring, aka "hypothetical in-band signaling abuse." This occurs because iTerm2 accepts the SSH conductor protocol from terminal output that does not originate from a legitimate conductor session.
CVE-2026-41253
“—” beside the score: it is equal to NVD's CVSS score.
Score 6.9 from GitHub Security Advisory published 2026-04-18. NVD baseline CVSS 6.9; sources differ by 0.0.
Also known asEUVD-2026-23656 (ENISA EUVD) · GHSA-5pgv-4jf4-9r43 (GitHub Security Advisories)Source: ENISA EUVD
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).
- CVSS v3
- 6.9
- EG Score
- 6.9MEDIUMmedium confidence
- EG Risk
- 47EG Risk 47/100
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)Severity69% × 45%Impact severity (EG Severity): CVSS 6.9 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.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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 referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation. - EPSS PROB
- 0.2%
- EPSS %ILE
- 9th
- 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 (6.9): severity, escalated by confirmed exploitation. This CVE's 6.9 is its impact severity (EG Severity), not escalated.
- EG Severity
- 6.9 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). 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, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.
A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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; Fix on system upgrade if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (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
April 18, 2026
Last Modified
May 18, 2026
Advisory Details (4)
Auto-updated May 18, 2026"cat readme.txt" is not safe if you use iTerm2 | Hacker News
https://news.ycombinator.com/item?id=47809190Harden SSH integration against hypothetical in-band signaling abuse · gnachman/iTerm2@a9e7459 · GitHub
https://github.com/gnachman/iTerm2/commit/a9e745993c2e2cbb30b884a16617cd5495899f86MAD Bugs: Even "cat readme.txt" is not safe - Calif
https://blog.calif.io/p/mad-bugs-even-cat-readmetxt-is-notWeakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 37× 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.
Showing the most recent 100 of 214 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 114 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-25 14:30 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-23 02:23 UTCEG score recompute
- 2026-10-23 02:23 UTCGHSA enrichmentGHSA-5pgv-4jf4-9r43 · GitHub CVSS 6.9
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-18 03:42 UTCEG score recompute
- 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-10-12 16:08 UTCEG score recompute
- 2026-10-11 19:51 UTCEG score recompute
- 2026-10-11 17:04 UTCEG score recompute
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- 2026-10-11 14:30 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-10-10 18:55 UTCOSV refresh
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.2% · 8th percentile
- 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-21 06:19 UTCOSV refresh
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-02 03:40 UTCOSV refresh
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-08-16 06:27 UTCEG score recompute
- 2026-08-16 06:27 UTCGHSA enrichmentGHSA-5pgv-4jf4-9r43 · GitHub CVSS 6.9
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-14 04:35 UTCEG score recompute
- 2026-08-14 04:35 UTCGHSA enrichmentGHSA-5pgv-4jf4-9r43 · GitHub CVSS 6.9
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-13 00:58 UTCEG score recompute
- 2026-08-13 00:58 UTCGHSA enrichmentGHSA-5pgv-4jf4-9r43 · GitHub CVSS 6.9
- 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-12 01:45 UTCEG score recompute
- 2026-08-12 01:45 UTCGHSA enrichmentGHSA-5pgv-4jf4-9r43 · GitHub CVSS 6.9
- 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-11 02:32 UTCEG score recompute
- 2026-08-11 02:32 UTCGHSA enrichmentGHSA-5pgv-4jf4-9r43 · GitHub CVSS 6.9
- 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-10 03:04 UTCEG score recompute
- 2026-08-10 03:04 UTCGHSA enrichmentGHSA-5pgv-4jf4-9r43 · GitHub CVSS 6.9
- 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-09 03:51 UTCEG score recompute
- 2026-08-09 03:51 UTCGHSA enrichmentGHSA-5pgv-4jf4-9r43 · GitHub CVSS 6.9
- 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-07 13:18 UTCEG score recompute
- 2026-08-07 13:17 UTCGHSA enrichmentGHSA-5pgv-4jf4-9r43 · GitHub CVSS 6.9
- 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.2% · 9th percentile
- 2026-08-05 23:17 UTCEG score recompute
- 2026-08-05 23:17 UTCGHSA enrichmentGHSA-5pgv-4jf4-9r43 · GitHub CVSS 6.9
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Frequently asked(5)
What is CVE-2026-41253?
When was the CVE record for CVE-2026-41253 published?
Is CVE-2026-41253 actively exploited?
What is the CVSS score of CVE-2026-41253?
How do I remediate CVE-2026-41253?
Dependency Blast Radius
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