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[v7.x] fix(decompress): treat inherited Object.prototype names as unsupported encodings (#5807) - #6024
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mrityunjay-pandey wants to merge 2 commits into
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[v7.x] fix(decompress): treat inherited Object.prototype names as unsupported encodings (#5807)#6024mrityunjay-pandey wants to merge 2 commits into
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…d encodings (nodejs#5807) supportedEncodings is a plain object literal, so the guard if (!supportedEncodings[encoding]) resolves inherited names through the prototype chain instead of rejecting them. onResponseStart lowercases the header first, which leaves exactly two reachable from the wire: constructor and __proto__. A response carrying Content-Encoding: constructor calls Object(), pushes the plain object it returns into the decompressor chain, and the request then never settles; __proto__ throws TypeError out of the interceptor. Give the table a null prototype so only its own entries can match. (cherry picked from commit ca5111e)
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## v7.x #6024 +/- ##
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Coverage 93.16% 93.17%
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Files 112 112
Lines 37632 37633 +1
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+ Hits 35059 35063 +4
+ Misses 2573 2570 -3 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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This was referenced Oct 15, 2026
metcoder95
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Oct 16, 2026
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This relates to...
Backport of #5807 to v7.x.
Rationale
supportedEncodingsinlib/interceptor/decompress.jsis a plain object literal on v7.x too, soContent-Encoding: constructoror__proto__resolves through the prototype chain. With the tests from #5807 applied tov7.x, theconstructorandgzip, constructorcases never settle and__proto__throws out of the interceptor (3 failing tests, the run hits the timeout).Changes
git cherry-pick -x), no conflicts:__proto__: nullon the encodings table, plus the tests from fix(decompress): treat inherited Object.prototype names as unsupported encodings #5807.Features
N/A
Bug Fixes
Object.prototypenames as unsupported encodings instead of hanging or throwing.Breaking Changes and Deprecations
N/A
Status
Tested locally on Linux with Node 24:
node --test test/interceptors/decompress.js(48 pass),npm run lintandnpm run test:unit(1324 tests, 1321 pass, 3 skipped, 0 fail).