Bug 2461634 (CVE-2026-42038)

Summary: CVE-2026-42038 axios: Axios: Information disclosure due to `no_proxy` bypass
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aazores, abarbaro, abrianik, abuckta, adudiak, akostadi, alcohan, alizardo, amasferr, anthomas, bbrownin, bdettelb, brasmith, caswilli, cdrage, chfoley, cmah, cmyers, cochase, dbosanac, dfreiber, dhanak, dkuc, dmayorov, dnakabaa, doconnor, dranck, drosa, drow, dschmidt, dymurray, eaguilar, ebaron, eborisov, ehelms, erezende, ewittman, fdeutsch, ggainey, ggrzybek, gmalinko, gparvin, ibek, ibolton, janstey, jbalunas, jburrell, jchui, jhe, jkoehler, jlanda, jlledo, jmatthew, jmontleo, jolong, jraez, jreimann, jrokos, juwatts, jwong, kaycoth, kshier, ktsao, lball, lchilton, lcouzens, lphiri, mdessi, mhulan, mnovotny, mrizzi, nboldt, ngough, nipatil, nmoumoul, oaljalju, omaciel, orabin, oramraz, osousa, pahickey, pantinor, parichar, pcattana, pcreech, pdelbell, pgaikwad, pjindal, psrna, rchan, rgodfrey, rhaigner, rhel-process-autobot, rjohnson, rkubis, rstepani, rushinde, sausingh, sdawley, sdoran, sfeifer, simaishi, slucidi, smallamp, smcdonal, smullick, sseago, stcannon, stirabos, swoodman, tasato, teagle, thason, tmalecek, tsedmik, veshanka, vkumar, watson-tool-maintainers, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Axios, a software library used for making web requests. This vulnerability allows an attacker to bypass the `no_proxy` configuration, which is designed to prevent certain internal network requests from being sent through an external proxy. Specifically, when `no_proxy=localhost` is set, requests intended for local system addresses (such as 127.0.0.1 and [::1]) are still routed through the proxy. This could lead to unintended exposure of internal network traffic or sensitive information.
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Description OSIDB Bzimport 2026-04-24 19:02:30 UTC 
Axios is a promise based HTTP client for the browser and Node.js. Prior to 1.15.1 and 0.31.1, he fix for no_proxy hostname normalization bypass is incomplete. When no_proxy=localhost is set, requests to 127.0.0.1 and [::1] still route through the proxy instead of bypassing it. The shouldBypassProxy() function does pure string matching — it does not resolve IP aliases or loopback equivalents. This vulnerability is fixed in 1.15.1 and 0.31.1.